S. M. Pershin, A. I. Vodchits, V. A. Orlovich, M. Ya. Grishin, I. A. Khodasevich
{"title":"New Nonlinear Optical Effect: 20-Fold Local Increase in Intensity in the Field of a Backward SRS Picosecond Pulse in Heavy Water","authors":"S. M. Pershin, A. I. Vodchits, V. A. Orlovich, M. Ya. Grishin, I. A. Khodasevich","doi":"10.3103/S1068335623602169","DOIUrl":null,"url":null,"abstract":"<p>We report for the first time, to our knowledge, the discovery of a new nonlinear optical effect in a stimulated Raman scattering (SRS) laser in heavy water as a Raman active medium: a 20-fold local increase in intensity of the backward SRS field up to the optical breakdown threshold (~40 TW/cm<sup>2</sup>) due to Kerr beam compression as the beam waist moves from bulk water to the surface at a constant pump pulse energy (57 ps, ~2 mJ, and 532 nm). The optical breakdown of water accompanied by ejection of droplets normally to the surface is achieved in a thin layer when the pump beam waist is located at a depth of 1‒3 mm. Outside this layer, the radiation intensity needed to achieve SRS does not exceed 2 TW/cm<sup>2</sup>. The detected energy concentration in a small volume indicates a high degree of spatiotemporal localization of summed Kerr nonlinear optical contributions to the refractive index and two-photon absorption coefficient, which leads to a local increase in field intensity and to an optical breakdown at a pulse energy 20 times lower than that in the absence of such summation of nonlinear optical contributions.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Lebedev Physics Institute","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.3103/S1068335623602169","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
We report for the first time, to our knowledge, the discovery of a new nonlinear optical effect in a stimulated Raman scattering (SRS) laser in heavy water as a Raman active medium: a 20-fold local increase in intensity of the backward SRS field up to the optical breakdown threshold (~40 TW/cm2) due to Kerr beam compression as the beam waist moves from bulk water to the surface at a constant pump pulse energy (57 ps, ~2 mJ, and 532 nm). The optical breakdown of water accompanied by ejection of droplets normally to the surface is achieved in a thin layer when the pump beam waist is located at a depth of 1‒3 mm. Outside this layer, the radiation intensity needed to achieve SRS does not exceed 2 TW/cm2. The detected energy concentration in a small volume indicates a high degree of spatiotemporal localization of summed Kerr nonlinear optical contributions to the refractive index and two-photon absorption coefficient, which leads to a local increase in field intensity and to an optical breakdown at a pulse energy 20 times lower than that in the absence of such summation of nonlinear optical contributions.
期刊介绍:
Bulletin of the Lebedev Physics Institute is an international peer reviewed journal that publishes results of new original experimental and theoretical studies on all topics of physics: theoretical physics; atomic and molecular physics; nuclear physics; optics; lasers; condensed matter; physics of solids; biophysics, and others.